mattermost/webapp/sass/routes/_loading.scss

@charset 'UTF-8';

@import "compass/css3/animation";

.loading-screen {
    display: table;
    height: 100%;
    padding: 60px;
    text-align: center;
    width: 100%;

    .loading__content {
        display: table-cell;
        font-size: 0;
        vertical-align: middle;

        h3 {
            display: inline-block;
            font-size: 16px;
            font-weight: 400;
            margin: 0 .2em;
        }

        .round {
            @include animation(move .75s infinite linear);
            @include border-radius(10px);
            background-color: #444444;
            display: inline-block;
            height: 4px;
            margin: 0 2px;
            opacity: .1;
            width: 4px;
        }

        @for $i from 1 through 3 {
            .round-#{$i} {
                @include animation-delay(.2s*$i);
            }
        }

        @include keyframes(move) {
            from {
                opacity: 1;
            }

            to {
                opacity: .1;
            }
        }
    }
}